Tension device



J. D. EATON.

TENSION DEVICE.

APPLICATION FILED JULY 6.1917.

1,364,259, 'Pat anted Jan. 4,1921.

:Lse/ol-a Ear/50H? UNITED STATES PATENT OFFICE.

JOSEPH D. EATON, OF NORTHAMPTON, MASSACHUSETTS.

TENSION DEVICE.

Application filed July 6, 1917. Serial N0. 178,988.

To all whom it may concern: Be it known that I, JOSEPH D. EATON, a citizen of the United States, residing at Northampton, in the county of Hampshire and State of Massachusetts, have invented certain new and useful Improvements in Tension Devices, of which the following is a specification.

This invention relates to tension devices and has special reference to means for holding the bobbins of silk weaving machines against sudden stoppages and insuring an even steady rotation of the same.

The invention is illustrated in the accompanying vdrawings and will be hereinafter fully described, the novel features being particularly pointed out in the claims following the detailed description.

In the drawings:

Figure 1 is an elevation of the improved tension device;

Fig. 2 is a longitudinal section of the same;

Fig. 3 is a transverse section on the line 33 of Fig. 2.

In carrying out my invention,- I employ a rod 1 which has a threaded portion 2 at one end and is equipped with nuts 3 upon said threaded portion which may be turned home against opposite sidesof any convenient part of the machine to which the device -15 to be applied. Mounted upon the rod between its ends is a collar or ring 4 equipped with a winged bolt 5 whereby the collar may be secured at any desired point on the rod. Near the said collar, a disk 6 of any preferred material and of any desired diameter is fitted closely upon the rod and this disk is provided on one face with a boss 7 and has its other face equipped with a facing of rubber, leather, or other friction creating material, as indicated at 8. A spring 9 is coiled around the rod 1 between the collar 4 and the disk 6, one end of the spring being fitted around the boss 7 and the other end being disposed within the collar 4 so that it may be secured to the supporting rod 1. .The bobbin 10 may be of the usual construction and is fitted loosely upon the rod with one end bearing against the friction facing 8 of the disk 6. Against the other end of the bobbin a Specification of Letters Patent.

washer 11 is fitted upon the rod and this washer s retained in place by any convenlent means, such as a cotter pin 12. It is thought the operation of the device will be readily understood. The filled bobbin is laced 1n position upon the rod 1 and the s1l or other thread is connected with the 1nstrumentalities, which are to act upon it, 1n the usual manner. As the bobbin I'otates under the pull exerted thereon through thethread, the speed of the bobbin will tend to throw the tension disk 6 away from its end, but this tendency of the disk to move from the bobbin is resisted by the spring 9 and it will be readily understood that by adyusting the collar 4 along the rod 1 the spring 9 may be placed under any desired tension. The friction or tension disk will thus be held constantly against the bobbin so that a constant steady pressure will be exerted thereon and sudden increases or decreases in the speed of rotation of the bobbin will be prevented.- Should the thread break so that the bobbin would tend to momentarily increase its speed and theri'eby permit an undue unwinding of the thread,

the friction exerted upon the bobbin through the tension disk will serve to prevent such excessive rotation and will effect a gradual stopping thereof.

y device is exceedingly simple in the construction and arrangement of its parts and effectually overcomes the breaking of the selvage or other damage which is now frequently encountered through the use of the usual suspended weights. The device maybe applied to any machine without requiring a reconstruction of the same and the cost of installation will be negligible.

Having thus described the invention, what is claimed as new is:

In a device of the class described, the combination with a supporting rod having a fixed abutment, and a bobbin rotatably mounted upon the rod and bearing at one end against the abutment, of means for tensioning the bobbin comprising a friction disk slidably and rotatably mounted upon the rod and bearing against the other end of the bobbin, a coiled spring disposed to the rod and adjustable longitudinally therethrough the collar and bearing against the of and interiorl'y of a diameter somewhat diametrically opposite side of the rod and greater than that of the rod the spring bebinding the sand terminal of the spring 10 ing provided at its other end with a straight against the rod and securing the collar in terminal extending longitudinally along the adjusted position upon the rod.

rod at one side thereof and between the rod In testimony whereof I afiix m signature. and the collar, and 'a set screw threaded JOSEPH D. EATOlK. [1,. s.] 

